Building box with square port

[Weeznur32 10+ year member]

I'm not using a L port for this box but just a square port. How do I calculate the port length? I want a 12 cubic foot box to 35hz with 144-168 square inches of port. Just dont know how long to make port. Thanks

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[DBDRAGGUY 10+ year member]

18.75 deep on 160 sq inches.

19.50 deep on 165 sq inches

16.40 deep on 144 sq inches

18.20 deep on 156 sq inches

 

[big jake 10+ year member]

18.75 deep on 160 sq inches.
19.50 deep on 165 sq inches

16.40 deep on 144 sq inches

18.20 deep on 156 sq inches

hey man you got pm

 

[DBDRAGGUY 10+ year member]

hey man you got pm

Pm returned.